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Generation, Transmission and Distribution, IEE Proceedings C

Issue 2 • Date March 1980

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Displaying Results 1 - 12 of 12
  • Negative-sequence currents and losses in the solid rotor of a turbogenerator

    Publication Year: 1980 , Page(s): 53 - 64
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1388 KB)  

    A two-dimensional numerical finite-difference method, taking into account the magnetic nonlinearity of the rotor steel, is used to calculate the magnetic field, eddy currents, and losses induced in the solid rotor of a turbogenerator running on steady unbalanced load. The effect of varying some of the design parameters is examined, and ways of reducing the total loss in the rotor by changing the distribution of the nonmagnetic wedges and the wedge material are outlined. View full abstract»

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  • Evaluating the reliability of electrical auxiliary systems in multi-unit generating stations

    Publication Year: 1980 , Page(s): 65 - 71
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (829 KB)  

    A method of evaluating the reliability of the electrical auxiliary system of a multi-unit station with interconnected or interconnectable unit and station supplies is described. The electrical auxiliary system may be represented in full, comprising transformers, cables, busbars, circuit breakers, normally-closed and normally-open interconnectors, parallel connections, standby generators, separate drives, etc. The method utilises the previously developed `cutset¿¿ technique for analysing electrical systems, and may be used to show to what extent the availability of the generating station is affected by the possible failures in the auxiliary system. Attention is drawn to the important role of the interconnectors and normally-open breakers, in overcoming the effect of long component repair times, and to the significant improvement of the auxiliary system reliability provided by standby gas turbine and diesel generators View full abstract»

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  • Overall approach to the reliability evaluation of composite generation and transmission systems

    Publication Year: 1980 , Page(s): 72 - 81
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1162 KB)  

    The reliability evaluation of combined generation and transmission systems is presently receiving considerable attention as utilities are finding it increasingly necessary to quantitatively evaluate individual busbar and overall system reliability indices. This paper presents an overview of the problem and describes a technique developed at the University of Saskatchewan which evaluates the busbar and system reliability indices by considering all possible simultaneous (or overlapping) independent outage combinations of generating units, transmission lines and transformers. The indices are calculated after alleviating line overloads, generator MVAr overloads etc. arising because of outage situations. Common-mode or common-cause outages of two transmission lines on the same right-of-way, or on the transmission tower, are also included in the analysis. A digital computer program developed for evaluating the reliability of a composite generation and transmission system is also described. The program can, at present, consider common-cause outages and all possible first and second order simultaneous independent outages. The effectiveness of the technique is illustrated by application to a 30-busbar model of a practical power system. View full abstract»

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  • Effect of field failure of a d.w.r. generator

    Publication Year: 1980 , Page(s): 82 - 89
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (706 KB)  

    Performance of a divided-winding-rotor (d.w.r) generator equipped with its controls and connected to an infinite busbar, has been studied under abnormal operating conditions such as (a) external 3-phase short circuit, (b) sustained loss of excitation in either of the field windings, and (c) double faults such as an external 3-phase short circuit and simultaneous opening of the reactive-field winding. The digital simulation shows that quick reversal of the reactive-winding current during an external fault is responsible in bringing the rotor m.m.f. back towards the pole axis and thus helps to maintain stability especially for faults of long duration. It is also found that the reversal of the reactive-winding current is not absolutely essential for external faults of shorter duration as the angle regulator, located on the torque winding, alone is quite capable of maintaining stability. It is also found that permanent loss of excitation of the reactive-field winding does not affect stability, whereas similar loss of excitation in the torque-field winding causes instability. View full abstract»

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  • Fast power-flow solution by the method of reduction and restoration

    Publication Year: 1980 , Page(s): 90 - 93
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (382 KB)  

    The paper gives a fast power-flow-solution technique retaining only voltage-controlled busbars in the iterative process. Voltages are represented in rectangular co-ordinates, and the change in voltages from the assumed values is estimated in the iterative process. Power mismatches are computed only at two stages instead of at every iteration. After obtaining convergence, the original network is restored and the voltages of the load busbars are calculated. The essential features of the method are (a) only voltage-controlled busbars are retained during the iterative process, (b) a smaller-order Jacobian is used which is computed and inverted only once, thereby reducing the time of computation, and (c) on convergence, the system is restored to the original size, giving the voltage of all the busbars. This method is faster than other methods and can be conveniently applied to analysis and planning studies of large power systems. View full abstract»

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  • Analytical method for the determination of the voltage distortion factor of a network loaded with a thyristor regulated direct-current motor drive

    Publication Year: 1980 , Page(s): 94 - 96
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (223 KB)  

    The analytical expression for the voltage-distortion factor of the network loaded with a three-phase thyristor convertor in bridge connection, which supplies a d.c motor armature, has been derived with neglected active resistance. Calculation results are represented by means of curves with normalised convertor current and source and phase inductance values. View full abstract»

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  • Auto-resetting interrupter for use with 11 kV triggered spark gaps

    Publication Year: 1980
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1222 KB)  

    Automatically resetting interrupters are necessary for interruption of the power-frequency currents following flashover of 11 kV triggered spark gaps, installed on overhead lines having no auto-reclosing facilities, in order to prevent sustained consumer outages. Development is described of a single-contact solenoid-operated interrupter with an oil-immersed armature designed to meet the requirement of fast operation and slow reset. Single-phase currents at voltages up to 3-4kV were interrupted successfully, with and without the triggered gap in series. (A triggered gap was found to have some interruption capability itself). The principle of interruption of current, at high voltage, by employing the same current in a solenoid is verified. High-pressure hydrogen generated by the arc is the chief arc-extinction agent. The internal pressure required to interrupt current at 6.35 kV is estimated to be several hundred kilotorr. Further development could result in an interrupter which meets the specification for application to the 11 kV system. View full abstract»

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  • New method for predetermination of true saturation characteristics of transformers and nonlinear reactors

    Publication Year: 1980 , Page(s): 106 - 110
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (527 KB)  

    A new method has been suggested for determining an analytical expression for the true saturation characteristic of transformers and nonlinear reactors from the manuracturer's data giving the conventional r.m.s. saturation curve. The accuracy of the technique is verified by the experimental results. The existing concept, namely, that the algorithm used for converting the true saturation characteristic to r.m.s. form is not invertible into the process of finding the instantaneous from the r.m.s curve, is found to be untrue. View full abstract»

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  • Book review: Electric Power Systems

    Publication Year: 1980
    Save to Project icon | PDF file iconPDF (110 KB)  
    Freely Available from IEEE
  • Discussions on published papers: editorial policy

    Publication Year: 1980
    Save to Project icon | PDF file iconPDF (151 KB)  
    Freely Available from IEEE
  • Discussion on ¿Use of London's electricity supply system for centralised control¿

    Publication Year: 1980 , Page(s): 111 - 113
    Save to Project icon | PDF file iconPDF (483 KB)  
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  • Discussion on ¿Interlamination voltages in large turbogenerators¿, ¿Influence of winding design on the axial flux in laminated-stator cores¿ and ¿Examination of flux distribution in segmented stator cores¿

    Publication Year: 1980 , Page(s): 114 - 120
    Save to Project icon | PDF file iconPDF (1164 KB)  
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